Azo coloring-matter.



. and the diazo compound is then introduced To an whom, it mzi wh'arri:

entrain srar a s ATE Q carton.

RICHARD KOTHE, OF VOHWINKEL, AND ANTON OSSENBECK, OF

EIJBER- FELD, GERMANY, 'ASSIGNORS TO FARBENFABRIKEN VORM. FRTEDR.

. BAYER & co, or ELBERFELD, GERMANY, A CORPORATION or GERMANY.

A20 CQLOFHNG MATTER.

No. 843,756. Specification of Letters Patent. Patented Feb. 12, 1907.

" Application filed November 6. 1906. Serial No. 342,288.

Be it known that we, RICHARD Koran and ANTON OSSENBECK, citizens Empire, residing at, res ectively, 'Vohwinkel, near Elberfeld, and El erfeld, in the Kingdom of Prussia, Germany, have invented new and useful 1m rovements in new Azo l Coloring-Matters, of which the following is a acidyes wool from acids aths red, which specification. l is changed to violet when chromed after dye- Ne. have found that new and valuable azo dyestuffs are obtained by combinin the diazo compounds of non-sulfonated c loro-ortho-aminophenolic com ounds with 2-arylamino-5-naphthol-7-sul onic acids.

The new dyestuiis are in the shape of their alkaline salts dark powders soluble in water and dyeing wool from acid-baths generally from red to violet shades, which on chroming change to from violet to blue to black fast shades. By reduction of the new dyestuffs with stannous chlorid and hydrochloric acid non-sulfonated chloro-ortho-aminophenolic compounds and 2-arylamino-5-naphthol-6- amino-7-sulfonic acids are obtained. 7

In carrying out the new process practically we can proceed as follows, the parts being by weight: 14.4 arts of 4-chlor0-2-ami-' nophenol are dia'zotized in the usual way,.

7 su fonic acids, such as 2-paratolylamino5- ino-5-naphthol-7-sulfonic acid, or the li The dyestuii obtained e. 9., from the diazo compound of 4 chloro 2 aminophenol and 2- aratolylamino-Ea-na hthol-7-sulfonic lhe dyestuffobtained from the diazo compound of 4-6-dichloro-2-aminophenol and 2 phenylamino 5 naphthol-7-sulfonic acid d es wool bordeaux, turning blue y pounds, and the dyestufi obtained from the diazo compound of 6-chloro-2-amino-4ecresol and 2 phenylamino 5 nafphthol 7 sulfonic acid dyes wool from aci turning to a navy blue when chromed after dyeing.

Having now in what manner the same is to be performed,

by Letters Patent, is-

1. The herein-described new azo dyestuffs obtainable by combining, diazo compounds of non-sul'fonated chloro-ortho-aminophenolic com ounds with 2-arylamino-5-naphinto a strongly alkaline solution of thirt -two thol-7-sul onic acids, which dyestuffs are, pars of 2-phenylamino-5naphthol-7 -su fonic aci The dyestuff separates after a short time. it is filtered off and dried. It is after being dried and' pulverized in the shape of its sodium salt a dark powder soluble in 'Water with a violet color and in concentrated sulfuric acid with a violet color. By reduction with stannous chlorid and hydrochloric acid 4-chloro-2-aminophenol and Z-phenylamino- 5-1}aphthol-6-amino-7-sulfonic acid isobtalned.

The new d estuii dyes wool from acidbatlis red sha es, which are changed to blueblack when chromed after dyeing.

The process is carried out in an analo ous manner on using other diazo compoun s of non-sulfonated chloro-ortho-aminophenolic of their a1 nous chlorid and ortho-aminophenolic compounds and 2-arylamino 5 -naphthol-G-amino-7 sulfon1c acids and dyeing wool from acid-baths generally from red to violet shades, which on chroining change to from violet to blue to black shades, substantially as hereinbefore described.

which can be obtained by combining diazotized4-chloro 2-aminophen0l with Z-phenylamino-5-naphthbl-7-su ionic acid,'wh1 ch dyestuff is, after beingdried and pulverized, 1n the shape of, its sodium salt' a dark powder soluble in water with a violet color and in concentrated sulfuric acid with a violet color;

com oundsor other 2-arylamino-5 naphtholdescribed our invention and,

after bein dried and pulverized, in theshapel taline salts dark powderssoluble in water; yielding upon reduction with stanydrochloric acid, chloro 5 of the German naphthol-7-sulfonic acid, Z-ortho-anisylamtoareddishi. treatment with chromium com- 1 baths bordeaux, l v

what we claim as new, and desire to secure 2. The herein-described new azo dyestuif,

yielding upon reduction with stannous ehloeet our hands in the presence of two subscribr'id and hydrochloric acid 4-chl0r0-2-amin0- ing Witnesses.

phenol and 2-phenylamin05-naphth0l-fi-amn0-7-sulf0nic acid;- and dy -3-ing W091 frgm I 5 acid-baths red Shades, which are changed to- I blue-black when chromed after dyeing, 'substantially as hereinbefore described. a In testimony whereof We have hereunto Witnesses:

OTTO KONIG, :J. A. RITTERSBAUS. 

